1/*
2 * linux/include/linux/edd.h
3 *  Copyright (C) 2002, 2003, 2004 Dell Inc.
4 *  by Matt Domsch <Matt_Domsch@dell.com>
5 *
6 * structures and definitions for the int 13h, ax={41,48}h
7 * BIOS Enhanced Disk Drive Services
8 * This is based on the T13 group document D1572 Revision 0 (August 14 2002)
9 * available at http://www.t13.org/docs2002/d1572r0.pdf.  It is
10 * very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf
11 *
12 * In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch
13 * table in the boot_params that contains a list of BIOS-enumerated
14 * boot devices.
15 * In arch/{i386,x86_64}/kernel/setup.c, this information is
16 * transferred into the edd structure, and in drivers/firmware/edd.c, that
17 * information is used to identify BIOS boot disk.  The code in setup.S
18 * is very sensitive to the size of these structures.
19 *
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License v2.0 as published by
22 * the Free Software Foundation
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
27 * GNU General Public License for more details.
28 *
29 */
30#ifndef _UAPI_LINUX_EDD_H
31#define _UAPI_LINUX_EDD_H
32
33#include <linux/types.h>
34
35#define EDDNR 0x1e9		/* addr of number of edd_info structs at EDDBUF
36				   in boot_params - treat this as 1 byte  */
37#define EDDBUF	0xd00		/* addr of edd_info structs in boot_params */
38#define EDDMAXNR 6		/* number of edd_info structs starting at EDDBUF  */
39#define EDDEXTSIZE 8		/* change these if you muck with the structures */
40#define EDDPARMSIZE 74
41#define CHECKEXTENSIONSPRESENT 0x41
42#define GETDEVICEPARAMETERS 0x48
43#define LEGACYGETDEVICEPARAMETERS 0x08
44#define EDDMAGIC1 0x55AA
45#define EDDMAGIC2 0xAA55
46
47
48#define READ_SECTORS 0x02         /* int13 AH=0x02 is READ_SECTORS command */
49#define EDD_MBR_SIG_OFFSET 0x1B8  /* offset of signature in the MBR */
50#define EDD_MBR_SIG_BUF    0x290  /* addr in boot params */
51#define EDD_MBR_SIG_MAX 16        /* max number of signatures to store */
52#define EDD_MBR_SIG_NR_BUF 0x1ea  /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
53				     in boot_params - treat this as 1 byte  */
54
55#ifndef __ASSEMBLY__
56
57#define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
58#define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
59#define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
60#define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)
61
62#define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
63#define EDD_INFO_GEOMETRY_VALID                (1 << 1)
64#define EDD_INFO_REMOVABLE                     (1 << 2)
65#define EDD_INFO_WRITE_VERIFY                  (1 << 3)
66#define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
67#define EDD_INFO_LOCKABLE                      (1 << 5)
68#define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
69#define EDD_INFO_USE_INT13_FN50                (1 << 7)
70
71struct edd_device_params {
72	__u16 length;
73	__u16 info_flags;
74	__u32 num_default_cylinders;
75	__u32 num_default_heads;
76	__u32 sectors_per_track;
77	__u64 number_of_sectors;
78	__u16 bytes_per_sector;
79	__u32 dpte_ptr;		/* 0xFFFFFFFF for our purposes */
80	__u16 key;		/* = 0xBEDD */
81	__u8 device_path_info_length;	/* = 44 */
82	__u8 reserved2;
83	__u16 reserved3;
84	__u8 host_bus_type[4];
85	__u8 interface_type[8];
86	union {
87		struct {
88			__u16 base_address;
89			__u16 reserved1;
90			__u32 reserved2;
91		} __attribute__ ((packed)) isa;
92		struct {
93			__u8 bus;
94			__u8 slot;
95			__u8 function;
96			__u8 channel;
97			__u32 reserved;
98		} __attribute__ ((packed)) pci;
99		/* pcix is same as pci */
100		struct {
101			__u64 reserved;
102		} __attribute__ ((packed)) ibnd;
103		struct {
104			__u64 reserved;
105		} __attribute__ ((packed)) xprs;
106		struct {
107			__u64 reserved;
108		} __attribute__ ((packed)) htpt;
109		struct {
110			__u64 reserved;
111		} __attribute__ ((packed)) unknown;
112	} interface_path;
113	union {
114		struct {
115			__u8 device;
116			__u8 reserved1;
117			__u16 reserved2;
118			__u32 reserved3;
119			__u64 reserved4;
120		} __attribute__ ((packed)) ata;
121		struct {
122			__u8 device;
123			__u8 lun;
124			__u8 reserved1;
125			__u8 reserved2;
126			__u32 reserved3;
127			__u64 reserved4;
128		} __attribute__ ((packed)) atapi;
129		struct {
130			__u16 id;
131			__u64 lun;
132			__u16 reserved1;
133			__u32 reserved2;
134		} __attribute__ ((packed)) scsi;
135		struct {
136			__u64 serial_number;
137			__u64 reserved;
138		} __attribute__ ((packed)) usb;
139		struct {
140			__u64 eui;
141			__u64 reserved;
142		} __attribute__ ((packed)) i1394;
143		struct {
144			__u64 wwid;
145			__u64 lun;
146		} __attribute__ ((packed)) fibre;
147		struct {
148			__u64 identity_tag;
149			__u64 reserved;
150		} __attribute__ ((packed)) i2o;
151		struct {
152			__u32 array_number;
153			__u32 reserved1;
154			__u64 reserved2;
155		} __attribute__ ((packed)) raid;
156		struct {
157			__u8 device;
158			__u8 reserved1;
159			__u16 reserved2;
160			__u32 reserved3;
161			__u64 reserved4;
162		} __attribute__ ((packed)) sata;
163		struct {
164			__u64 reserved1;
165			__u64 reserved2;
166		} __attribute__ ((packed)) unknown;
167	} device_path;
168	__u8 reserved4;
169	__u8 checksum;
170} __attribute__ ((packed));
171
172struct edd_info {
173	__u8 device;
174	__u8 version;
175	__u16 interface_support;
176	__u16 legacy_max_cylinder;
177	__u8 legacy_max_head;
178	__u8 legacy_sectors_per_track;
179	struct edd_device_params params;
180} __attribute__ ((packed));
181
182struct edd {
183	unsigned int mbr_signature[EDD_MBR_SIG_MAX];
184	struct edd_info edd_info[EDDMAXNR];
185	unsigned char mbr_signature_nr;
186	unsigned char edd_info_nr;
187};
188
189#endif				/*!__ASSEMBLY__ */
190
191#endif /* _UAPI_LINUX_EDD_H */
192